EP 0541911 B1 19950927 - Method for improving the capability of a body to withstand stress in rotation.
Title (en)
Method for improving the capability of a body to withstand stress in rotation.
Title (de)
Verfahren zur Verbesserung der Belastbarkeit eines rotierenden Körpers.
Title (fr)
Procédé pour améliorer la charge admissible d'un corps tournant.
Publication
Application
Priority
US 79239491 A 19911115
Abstract (en)
[origin: CA2076243A1] IMPELLER STRESS IMPROVEMENT THROUGH OVERSPEED A method for improving the capability of a body to withstand stress during rotation of the body by inducing at a selected location in the body a residual compressive stress which opposes the steady tensile stress produced by rotation. The method comprises rotating the body at a succession of increasing peak speeds in excess of the design speed to induce tolerable yielding and residual compressive stress at each location experiencing higher steady tensile stress than the selected location. The succession proceeds from the location experiencing the highest steady tensile stress above that at the selected location to the location experiencing the lowest steady tensile stress above that at the selected location. Then the body is rotated to a still higher peak speed to induce tolerable yielding and residual compressive stress at the selected location. D-16827
IPC 1-7
IPC 8 full level
F01D 1/06 (2006.01); C21D 7/02 (2006.01); F01D 5/14 (2006.01); F01D 5/28 (2006.01); C21D 7/12 (2006.01)
CPC (source: EP KR US)
C21D 7/02 (2013.01 - EP US); F01D 1/00 (2013.01 - KR); F01D 5/286 (2013.01 - EP US); F04D 29/284 (2013.01 - EP US); C21D 7/12 (2013.01 - EP US); Y10T 29/4932 (2015.01 - EP US)
Designated contracting state (EPC)
BE CH DE ES FR GB IT LI
DOCDB simple family (publication)
US 5158435 A 19921027; BR 9203167 A 19930518; CA 2076243 A1 19930516; CN 1072754 A 19930602; DE 69205119 D1 19951102; DE 69205119 T2 19960509; EP 0541911 A1 19930519; EP 0541911 B1 19950927; ES 2077312 T3 19951116; JP H05263601 A 19931012; KR 930010348 A 19930622; MX 9204729 A 19930701
DOCDB simple family (application)
US 79239491 A 19911115; BR 9203167 A 19920814; CA 2076243 A 19920817; CN 92109553 A 19920815; DE 69205119 T 19920815; EP 92113935 A 19920815; ES 92113935 T 19920815; JP 23759192 A 19920814; KR 920014640 A 19920814; MX 9204729 A 19920814